potiuk commented on a change in pull request #20795:
URL: https://github.com/apache/airflow/pull/20795#discussion_r782993963



##########
File path: airflow/utils/log/logging_mixin.py
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@@ -73,11 +73,23 @@ def supports_external_link(self) -> bool:
         """Return whether handler is able to support external links."""
 
 
-class StreamLogWriter(IOBase):
+class StreamLogWriter(IO[str], IOBase):
     """Allows to redirect stdout and stderr to logger"""
 
     encoding: None = None
 
+    def fileno(self) -> int:

Review comment:
       Hmmm. I had the impression this has been here already :)




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